On our ESP Report Server started task, we can see it is generating excessive output in STDOUT output causing the JES2 spool to fill up.
How to spin STDOUT output in Report Server STC?
Use SPIN parm on STDOUT, like:
//STDOUT DD SYSOUT=A,SPIN=(UNALLOC,5K)
Another option is to issue JES2 command $T with SPIN[,DDname=jxxxxxxx], see link below for more detail:
http://www.ibm.com/support/knowledgecenter/SSLTBW_2.1.0/com.ibm.zos.v2r1.hasa200/cjcspsa.htm
See related IBM JES manuals.